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ARM: dts: add 'dr_mode' property to hsotg devices for exynos boards
[linux/fpc-iii.git] / net / ipv6 / ip6_tunnel.c
blob92b3da571980670e4f343a278eec49521057be1e
1 /*
2 * IPv6 tunneling device
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
8 *
9 * Based on:
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
11 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/sockios.h>
28 #include <linux/icmp.h>
29 #include <linux/if.h>
30 #include <linux/in.h>
31 #include <linux/ip.h>
32 #include <linux/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/init.h>
38 #include <linux/route.h>
39 #include <linux/rtnetlink.h>
40 #include <linux/netfilter_ipv6.h>
41 #include <linux/slab.h>
42 #include <linux/hash.h>
43 #include <linux/etherdevice.h>
44
45 #include <asm/uaccess.h>
46 #include <linux/atomic.h>
47
48 #include <net/icmp.h>
49 #include <net/ip.h>
50 #include <net/ip_tunnels.h>
51 #include <net/ipv6.h>
52 #include <net/ip6_route.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_tunnel.h>
55 #include <net/xfrm.h>
56 #include <net/dsfield.h>
57 #include <net/inet_ecn.h>
58 #include <net/net_namespace.h>
59 #include <net/netns/generic.h>
60
61 MODULE_AUTHOR("Ville Nuorvala");
62 MODULE_DESCRIPTION("IPv6 tunneling device");
63 MODULE_LICENSE("GPL");
64 MODULE_ALIAS_RTNL_LINK("ip6tnl");
65 MODULE_ALIAS_NETDEV("ip6tnl0");
66
67 #ifdef IP6_TNL_DEBUG
68 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
69 #else
70 #define IP6_TNL_TRACE(x...) do {;} while(0)
71 #endif
72
73 #define HASH_SIZE_SHIFT 5
74 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
75
76 static bool log_ecn_error = true;
77 module_param(log_ecn_error, bool, 0644);
78 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
79
80 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
81 {
82 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
83
84 return hash_32(hash, HASH_SIZE_SHIFT);
85 }
86
87 static int ip6_tnl_dev_init(struct net_device *dev);
88 static void ip6_tnl_dev_setup(struct net_device *dev);
89 static struct rtnl_link_ops ip6_link_ops __read_mostly;
90
91 static int ip6_tnl_net_id __read_mostly;
92 struct ip6_tnl_net {
93 /* the IPv6 tunnel fallback device */
94 struct net_device *fb_tnl_dev;
95 /* lists for storing tunnels in use */
96 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
97 struct ip6_tnl __rcu *tnls_wc[1];
98 struct ip6_tnl __rcu **tnls[2];
99 };
100
101 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
102 {
103 struct pcpu_sw_netstats tmp, sum = { 0 };
104 int i;
105
106 for_each_possible_cpu(i) {
107 unsigned int start;
108 const struct pcpu_sw_netstats *tstats =
109 per_cpu_ptr(dev->tstats, i);
110
111 do {
112 start = u64_stats_fetch_begin_irq(&tstats->syncp);
113 tmp.rx_packets = tstats->rx_packets;
114 tmp.rx_bytes = tstats->rx_bytes;
115 tmp.tx_packets = tstats->tx_packets;
116 tmp.tx_bytes = tstats->tx_bytes;
117 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
118
119 sum.rx_packets += tmp.rx_packets;
120 sum.rx_bytes += tmp.rx_bytes;
121 sum.tx_packets += tmp.tx_packets;
122 sum.tx_bytes += tmp.tx_bytes;
123 }
124 dev->stats.rx_packets = sum.rx_packets;
125 dev->stats.rx_bytes = sum.rx_bytes;
126 dev->stats.tx_packets = sum.tx_packets;
127 dev->stats.tx_bytes = sum.tx_bytes;
128 return &dev->stats;
129 }
130
131 /*
132 * Locking : hash tables are protected by RCU and RTNL
133 */
134
135 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
136 {
137 struct dst_entry *dst = t->dst_cache;
138
139 if (dst && dst->obsolete &&
140 dst->ops->check(dst, t->dst_cookie) == NULL) {
141 t->dst_cache = NULL;
142 dst_release(dst);
143 return NULL;
144 }
145
146 return dst;
147 }
148 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
149
150 void ip6_tnl_dst_reset(struct ip6_tnl *t)
151 {
152 dst_release(t->dst_cache);
153 t->dst_cache = NULL;
154 }
155 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
156
157 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
158 {
159 struct rt6_info *rt = (struct rt6_info *) dst;
160 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
161 dst_release(t->dst_cache);
162 t->dst_cache = dst;
163 }
164 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
165
166 /**
167 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
168 * @remote: the address of the tunnel exit-point
169 * @local: the address of the tunnel entry-point
170 *
171 * Return:
172 * tunnel matching given end-points if found,
173 * else fallback tunnel if its device is up,
174 * else %NULL
175 **/
176
177 #define for_each_ip6_tunnel_rcu(start) \
178 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
179
180 static struct ip6_tnl *
181 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
182 {
183 unsigned int hash = HASH(remote, local);
184 struct ip6_tnl *t;
185 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
186 struct in6_addr any;
187
188 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
189 if (ipv6_addr_equal(local, &t->parms.laddr) &&
190 ipv6_addr_equal(remote, &t->parms.raddr) &&
191 (t->dev->flags & IFF_UP))
192 return t;
193 }
194
195 memset(&any, 0, sizeof(any));
196 hash = HASH(&any, local);
197 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
198 if (ipv6_addr_equal(local, &t->parms.laddr) &&
199 (t->dev->flags & IFF_UP))
200 return t;
201 }
202
203 hash = HASH(remote, &any);
204 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
205 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
206 (t->dev->flags & IFF_UP))
207 return t;
208 }
209
210 t = rcu_dereference(ip6n->tnls_wc[0]);
211 if (t && (t->dev->flags & IFF_UP))
212 return t;
213
214 return NULL;
215 }
216
217 /**
218 * ip6_tnl_bucket - get head of list matching given tunnel parameters
219 * @p: parameters containing tunnel end-points
220 *
221 * Description:
222 * ip6_tnl_bucket() returns the head of the list matching the
223 * &struct in6_addr entries laddr and raddr in @p.
224 *
225 * Return: head of IPv6 tunnel list
226 **/
227
228 static struct ip6_tnl __rcu **
229 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
230 {
231 const struct in6_addr *remote = &p->raddr;
232 const struct in6_addr *local = &p->laddr;
233 unsigned int h = 0;
234 int prio = 0;
235
236 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
237 prio = 1;
238 h = HASH(remote, local);
239 }
240 return &ip6n->tnls[prio][h];
241 }
242
243 /**
244 * ip6_tnl_link - add tunnel to hash table
245 * @t: tunnel to be added
246 **/
247
248 static void
249 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
250 {
251 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
252
253 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
254 rcu_assign_pointer(*tp, t);
255 }
256
257 /**
258 * ip6_tnl_unlink - remove tunnel from hash table
259 * @t: tunnel to be removed
260 **/
261
262 static void
263 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
264 {
265 struct ip6_tnl __rcu **tp;
266 struct ip6_tnl *iter;
267
268 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
269 (iter = rtnl_dereference(*tp)) != NULL;
270 tp = &iter->next) {
271 if (t == iter) {
272 rcu_assign_pointer(*tp, t->next);
273 break;
274 }
275 }
276 }
277
278 static void ip6_dev_free(struct net_device *dev)
279 {
280 free_percpu(dev->tstats);
281 free_netdev(dev);
282 }
283
284 static int ip6_tnl_create2(struct net_device *dev)
285 {
286 struct ip6_tnl *t = netdev_priv(dev);
287 struct net *net = dev_net(dev);
288 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
289 int err;
290
291 t = netdev_priv(dev);
292
293 err = register_netdevice(dev);
294 if (err < 0)
295 goto out;
296
297 strcpy(t->parms.name, dev->name);
298 dev->rtnl_link_ops = &ip6_link_ops;
299
300 dev_hold(dev);
301 ip6_tnl_link(ip6n, t);
302 return 0;
303
304 out:
305 return err;
306 }
307
308 /**
309 * ip6_tnl_create - create a new tunnel
310 * @p: tunnel parameters
311 * @pt: pointer to new tunnel
312 *
313 * Description:
314 * Create tunnel matching given parameters.
315 *
316 * Return:
317 * created tunnel or NULL
318 **/
319
320 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
321 {
322 struct net_device *dev;
323 struct ip6_tnl *t;
324 char name[IFNAMSIZ];
325 int err;
326
327 if (p->name[0])
328 strlcpy(name, p->name, IFNAMSIZ);
329 else
330 sprintf(name, "ip6tnl%%d");
331
332 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
333 ip6_tnl_dev_setup);
334 if (dev == NULL)
335 goto failed;
336
337 dev_net_set(dev, net);
338
339 t = netdev_priv(dev);
340 t->parms = *p;
341 t->net = dev_net(dev);
342 err = ip6_tnl_create2(dev);
343 if (err < 0)
344 goto failed_free;
345
346 return t;
347
348 failed_free:
349 ip6_dev_free(dev);
350 failed:
351 return NULL;
352 }
353
354 /**
355 * ip6_tnl_locate - find or create tunnel matching given parameters
356 * @p: tunnel parameters
357 * @create: != 0 if allowed to create new tunnel if no match found
358 *
359 * Description:
360 * ip6_tnl_locate() first tries to locate an existing tunnel
361 * based on @parms. If this is unsuccessful, but @create is set a new
362 * tunnel device is created and registered for use.
363 *
364 * Return:
365 * matching tunnel or NULL
366 **/
367
368 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
369 struct __ip6_tnl_parm *p, int create)
370 {
371 const struct in6_addr *remote = &p->raddr;
372 const struct in6_addr *local = &p->laddr;
373 struct ip6_tnl __rcu **tp;
374 struct ip6_tnl *t;
375 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
376
377 for (tp = ip6_tnl_bucket(ip6n, p);
378 (t = rtnl_dereference(*tp)) != NULL;
379 tp = &t->next) {
380 if (ipv6_addr_equal(local, &t->parms.laddr) &&
381 ipv6_addr_equal(remote, &t->parms.raddr)) {
382 if (create)
383 return NULL;
384
385 return t;
386 }
387 }
388 if (!create)
389 return NULL;
390 return ip6_tnl_create(net, p);
391 }
392
393 /**
394 * ip6_tnl_dev_uninit - tunnel device uninitializer
395 * @dev: the device to be destroyed
396 *
397 * Description:
398 * ip6_tnl_dev_uninit() removes tunnel from its list
399 **/
400
401 static void
402 ip6_tnl_dev_uninit(struct net_device *dev)
403 {
404 struct ip6_tnl *t = netdev_priv(dev);
405 struct net *net = t->net;
406 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
407
408 if (dev == ip6n->fb_tnl_dev)
409 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
410 else
411 ip6_tnl_unlink(ip6n, t);
412 ip6_tnl_dst_reset(t);
413 dev_put(dev);
414 }
415
416 /**
417 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
418 * @skb: received socket buffer
419 *
420 * Return:
421 * 0 if none was found,
422 * else index to encapsulation limit
423 **/
424
425 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
426 {
427 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
428 __u8 nexthdr = ipv6h->nexthdr;
429 __u16 off = sizeof(*ipv6h);
430
431 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
432 __u16 optlen = 0;
433 struct ipv6_opt_hdr *hdr;
434 if (raw + off + sizeof(*hdr) > skb->data &&
435 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
436 break;
437
438 hdr = (struct ipv6_opt_hdr *) (raw + off);
439 if (nexthdr == NEXTHDR_FRAGMENT) {
440 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
441 if (frag_hdr->frag_off)
442 break;
443 optlen = 8;
444 } else if (nexthdr == NEXTHDR_AUTH) {
445 optlen = (hdr->hdrlen + 2) << 2;
446 } else {
447 optlen = ipv6_optlen(hdr);
448 }
449 if (nexthdr == NEXTHDR_DEST) {
450 __u16 i = off + 2;
451 while (1) {
452 struct ipv6_tlv_tnl_enc_lim *tel;
453
454 /* No more room for encapsulation limit */
455 if (i + sizeof (*tel) > off + optlen)
456 break;
457
458 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
459 /* return index of option if found and valid */
460 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
461 tel->length == 1)
462 return i;
463 /* else jump to next option */
464 if (tel->type)
465 i += tel->length + 2;
466 else
467 i++;
468 }
469 }
470 nexthdr = hdr->nexthdr;
471 off += optlen;
472 }
473 return 0;
474 }
475 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
476
477 /**
478 * ip6_tnl_err - tunnel error handler
479 *
480 * Description:
481 * ip6_tnl_err() should handle errors in the tunnel according
482 * to the specifications in RFC 2473.
483 **/
484
485 static int
486 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
487 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
488 {
489 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
490 struct ip6_tnl *t;
491 int rel_msg = 0;
492 u8 rel_type = ICMPV6_DEST_UNREACH;
493 u8 rel_code = ICMPV6_ADDR_UNREACH;
494 u8 tproto;
495 __u32 rel_info = 0;
496 __u16 len;
497 int err = -ENOENT;
498
499 /* If the packet doesn't contain the original IPv6 header we are
500 in trouble since we might need the source address for further
501 processing of the error. */
502
503 rcu_read_lock();
504 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
505 if (t == NULL)
506 goto out;
507
508 tproto = ACCESS_ONCE(t->parms.proto);
509 if (tproto != ipproto && tproto != 0)
510 goto out;
511
512 err = 0;
513
514 switch (*type) {
515 __u32 teli;
516 struct ipv6_tlv_tnl_enc_lim *tel;
517 __u32 mtu;
518 case ICMPV6_DEST_UNREACH:
519 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
520 t->parms.name);
521 rel_msg = 1;
522 break;
523 case ICMPV6_TIME_EXCEED:
524 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
525 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
526 t->parms.name);
527 rel_msg = 1;
528 }
529 break;
530 case ICMPV6_PARAMPROB:
531 teli = 0;
532 if ((*code) == ICMPV6_HDR_FIELD)
533 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
534
535 if (teli && teli == *info - 2) {
536 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
537 if (tel->encap_limit == 0) {
538 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
539 t->parms.name);
540 rel_msg = 1;
541 }
542 } else {
543 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
544 t->parms.name);
545 }
546 break;
547 case ICMPV6_PKT_TOOBIG:
548 mtu = *info - offset;
549 if (mtu < IPV6_MIN_MTU)
550 mtu = IPV6_MIN_MTU;
551 t->dev->mtu = mtu;
552
553 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
554 if (len > mtu) {
555 rel_type = ICMPV6_PKT_TOOBIG;
556 rel_code = 0;
557 rel_info = mtu;
558 rel_msg = 1;
559 }
560 break;
561 }
562
563 *type = rel_type;
564 *code = rel_code;
565 *info = rel_info;
566 *msg = rel_msg;
567
568 out:
569 rcu_read_unlock();
570 return err;
571 }
572
573 static int
574 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
575 u8 type, u8 code, int offset, __be32 info)
576 {
577 int rel_msg = 0;
578 u8 rel_type = type;
579 u8 rel_code = code;
580 __u32 rel_info = ntohl(info);
581 int err;
582 struct sk_buff *skb2;
583 const struct iphdr *eiph;
584 struct rtable *rt;
585 struct flowi4 fl4;
586
587 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
588 &rel_msg, &rel_info, offset);
589 if (err < 0)
590 return err;
591
592 if (rel_msg == 0)
593 return 0;
594
595 switch (rel_type) {
596 case ICMPV6_DEST_UNREACH:
597 if (rel_code != ICMPV6_ADDR_UNREACH)
598 return 0;
599 rel_type = ICMP_DEST_UNREACH;
600 rel_code = ICMP_HOST_UNREACH;
601 break;
602 case ICMPV6_PKT_TOOBIG:
603 if (rel_code != 0)
604 return 0;
605 rel_type = ICMP_DEST_UNREACH;
606 rel_code = ICMP_FRAG_NEEDED;
607 break;
608 case NDISC_REDIRECT:
609 rel_type = ICMP_REDIRECT;
610 rel_code = ICMP_REDIR_HOST;
611 default:
612 return 0;
613 }
614
615 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
616 return 0;
617
618 skb2 = skb_clone(skb, GFP_ATOMIC);
619 if (!skb2)
620 return 0;
621
622 skb_dst_drop(skb2);
623
624 skb_pull(skb2, offset);
625 skb_reset_network_header(skb2);
626 eiph = ip_hdr(skb2);
627
628 /* Try to guess incoming interface */
629 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
630 eiph->saddr, 0,
631 0, 0,
632 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
633 if (IS_ERR(rt))
634 goto out;
635
636 skb2->dev = rt->dst.dev;
637
638 /* route "incoming" packet */
639 if (rt->rt_flags & RTCF_LOCAL) {
640 ip_rt_put(rt);
641 rt = NULL;
642 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
643 eiph->daddr, eiph->saddr,
644 0, 0,
645 IPPROTO_IPIP,
646 RT_TOS(eiph->tos), 0);
647 if (IS_ERR(rt) ||
648 rt->dst.dev->type != ARPHRD_TUNNEL) {
649 if (!IS_ERR(rt))
650 ip_rt_put(rt);
651 goto out;
652 }
653 skb_dst_set(skb2, &rt->dst);
654 } else {
655 ip_rt_put(rt);
656 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
657 skb2->dev) ||
658 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
659 goto out;
660 }
661
662 /* change mtu on this route */
663 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
664 if (rel_info > dst_mtu(skb_dst(skb2)))
665 goto out;
666
667 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
668 }
669 if (rel_type == ICMP_REDIRECT)
670 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
671
672 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
673
674 out:
675 kfree_skb(skb2);
676 return 0;
677 }
678
679 static int
680 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
681 u8 type, u8 code, int offset, __be32 info)
682 {
683 int rel_msg = 0;
684 u8 rel_type = type;
685 u8 rel_code = code;
686 __u32 rel_info = ntohl(info);
687 int err;
688
689 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
690 &rel_msg, &rel_info, offset);
691 if (err < 0)
692 return err;
693
694 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
695 struct rt6_info *rt;
696 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
697
698 if (!skb2)
699 return 0;
700
701 skb_dst_drop(skb2);
702 skb_pull(skb2, offset);
703 skb_reset_network_header(skb2);
704
705 /* Try to guess incoming interface */
706 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
707 NULL, 0, 0);
708
709 if (rt && rt->dst.dev)
710 skb2->dev = rt->dst.dev;
711
712 icmpv6_send(skb2, rel_type, rel_code, rel_info);
713
714 ip6_rt_put(rt);
715
716 kfree_skb(skb2);
717 }
718
719 return 0;
720 }
721
722 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
723 const struct ipv6hdr *ipv6h,
724 struct sk_buff *skb)
725 {
726 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
727
728 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
729 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
730
731 return IP6_ECN_decapsulate(ipv6h, skb);
732 }
733
734 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
735 const struct ipv6hdr *ipv6h,
736 struct sk_buff *skb)
737 {
738 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
739 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
740
741 return IP6_ECN_decapsulate(ipv6h, skb);
742 }
743
744 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
745 const struct in6_addr *laddr,
746 const struct in6_addr *raddr)
747 {
748 struct __ip6_tnl_parm *p = &t->parms;
749 int ltype = ipv6_addr_type(laddr);
750 int rtype = ipv6_addr_type(raddr);
751 __u32 flags = 0;
752
753 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
754 flags = IP6_TNL_F_CAP_PER_PACKET;
755 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
756 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
757 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
758 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
759 if (ltype&IPV6_ADDR_UNICAST)
760 flags |= IP6_TNL_F_CAP_XMIT;
761 if (rtype&IPV6_ADDR_UNICAST)
762 flags |= IP6_TNL_F_CAP_RCV;
763 }
764 return flags;
765 }
766 EXPORT_SYMBOL(ip6_tnl_get_cap);
767
768 /* called with rcu_read_lock() */
769 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
770 const struct in6_addr *laddr,
771 const struct in6_addr *raddr)
772 {
773 struct __ip6_tnl_parm *p = &t->parms;
774 int ret = 0;
775 struct net *net = t->net;
776
777 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
778 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
779 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
780 struct net_device *ldev = NULL;
781
782 if (p->link)
783 ldev = dev_get_by_index_rcu(net, p->link);
784
785 if ((ipv6_addr_is_multicast(laddr) ||
786 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
787 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
788 ret = 1;
789 }
790 return ret;
791 }
792 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
793
794 /**
795 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
796 * @skb: received socket buffer
797 * @protocol: ethernet protocol ID
798 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
799 *
800 * Return: 0
801 **/
802
803 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
804 __u8 ipproto,
805 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
806 const struct ipv6hdr *ipv6h,
807 struct sk_buff *skb))
808 {
809 struct ip6_tnl *t;
810 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
811 u8 tproto;
812 int err;
813
814 rcu_read_lock();
815 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
816 if (t != NULL) {
817 struct pcpu_sw_netstats *tstats;
818
819 tproto = ACCESS_ONCE(t->parms.proto);
820 if (tproto != ipproto && tproto != 0) {
821 rcu_read_unlock();
822 goto discard;
823 }
824
825 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
826 rcu_read_unlock();
827 goto discard;
828 }
829
830 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
831 t->dev->stats.rx_dropped++;
832 rcu_read_unlock();
833 goto discard;
834 }
835 skb->mac_header = skb->network_header;
836 skb_reset_network_header(skb);
837 skb->protocol = htons(protocol);
838 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
839
840 __skb_tunnel_rx(skb, t->dev, t->net);
841
842 err = dscp_ecn_decapsulate(t, ipv6h, skb);
843 if (unlikely(err)) {
844 if (log_ecn_error)
845 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
846 &ipv6h->saddr,
847 ipv6_get_dsfield(ipv6h));
848 if (err > 1) {
849 ++t->dev->stats.rx_frame_errors;
850 ++t->dev->stats.rx_errors;
851 rcu_read_unlock();
852 goto discard;
853 }
854 }
855
856 tstats = this_cpu_ptr(t->dev->tstats);
857 u64_stats_update_begin(&tstats->syncp);
858 tstats->rx_packets++;
859 tstats->rx_bytes += skb->len;
860 u64_stats_update_end(&tstats->syncp);
861
862 netif_rx(skb);
863
864 rcu_read_unlock();
865 return 0;
866 }
867 rcu_read_unlock();
868 return 1;
869
870 discard:
871 kfree_skb(skb);
872 return 0;
873 }
874
875 static int ip4ip6_rcv(struct sk_buff *skb)
876 {
877 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
878 ip4ip6_dscp_ecn_decapsulate);
879 }
880
881 static int ip6ip6_rcv(struct sk_buff *skb)
882 {
883 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
884 ip6ip6_dscp_ecn_decapsulate);
885 }
886
887 struct ipv6_tel_txoption {
888 struct ipv6_txoptions ops;
889 __u8 dst_opt[8];
890 };
891
892 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
893 {
894 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
895
896 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
897 opt->dst_opt[3] = 1;
898 opt->dst_opt[4] = encap_limit;
899 opt->dst_opt[5] = IPV6_TLV_PADN;
900 opt->dst_opt[6] = 1;
901
902 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
903 opt->ops.opt_nflen = 8;
904 }
905
906 /**
907 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
908 * @t: the outgoing tunnel device
909 * @hdr: IPv6 header from the incoming packet
910 *
911 * Description:
912 * Avoid trivial tunneling loop by checking that tunnel exit-point
913 * doesn't match source of incoming packet.
914 *
915 * Return:
916 * 1 if conflict,
917 * 0 else
918 **/
919
920 static inline bool
921 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
922 {
923 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
924 }
925
926 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
927 const struct in6_addr *laddr,
928 const struct in6_addr *raddr)
929 {
930 struct __ip6_tnl_parm *p = &t->parms;
931 int ret = 0;
932 struct net *net = t->net;
933
934 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
935 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
936 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
937 struct net_device *ldev = NULL;
938
939 rcu_read_lock();
940 if (p->link)
941 ldev = dev_get_by_index_rcu(net, p->link);
942
943 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
944 pr_warn("%s xmit: Local address not yet configured!\n",
945 p->name);
946 else if (!ipv6_addr_is_multicast(raddr) &&
947 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
948 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
949 p->name);
950 else
951 ret = 1;
952 rcu_read_unlock();
953 }
954 return ret;
955 }
956 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
957
958 /**
959 * ip6_tnl_xmit2 - encapsulate packet and send
960 * @skb: the outgoing socket buffer
961 * @dev: the outgoing tunnel device
962 * @dsfield: dscp code for outer header
963 * @fl: flow of tunneled packet
964 * @encap_limit: encapsulation limit
965 * @pmtu: Path MTU is stored if packet is too big
966 *
967 * Description:
968 * Build new header and do some sanity checks on the packet before sending
969 * it.
970 *
971 * Return:
972 * 0 on success
973 * -1 fail
974 * %-EMSGSIZE message too big. return mtu in this case.
975 **/
976
977 static int ip6_tnl_xmit2(struct sk_buff *skb,
978 struct net_device *dev,
979 __u8 dsfield,
980 struct flowi6 *fl6,
981 int encap_limit,
982 __u32 *pmtu)
983 {
984 struct ip6_tnl *t = netdev_priv(dev);
985 struct net *net = t->net;
986 struct net_device_stats *stats = &t->dev->stats;
987 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
988 struct ipv6_tel_txoption opt;
989 struct dst_entry *dst = NULL, *ndst = NULL;
990 struct net_device *tdev;
991 int mtu;
992 unsigned int max_headroom = sizeof(struct ipv6hdr);
993 u8 proto;
994 int err = -1;
995
996 /* NBMA tunnel */
997 if (ipv6_addr_any(&t->parms.raddr)) {
998 struct in6_addr *addr6;
999 struct neighbour *neigh;
1000 int addr_type;
1001
1002 if (!skb_dst(skb))
1003 goto tx_err_link_failure;
1004
1005 neigh = dst_neigh_lookup(skb_dst(skb),
1006 &ipv6_hdr(skb)->daddr);
1007 if (!neigh)
1008 goto tx_err_link_failure;
1009
1010 addr6 = (struct in6_addr *)&neigh->primary_key;
1011 addr_type = ipv6_addr_type(addr6);
1012
1013 if (addr_type == IPV6_ADDR_ANY)
1014 addr6 = &ipv6_hdr(skb)->daddr;
1015
1016 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1017 neigh_release(neigh);
1018 } else if (!fl6->flowi6_mark)
1019 dst = ip6_tnl_dst_check(t);
1020
1021 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1022 goto tx_err_link_failure;
1023
1024 if (!dst) {
1025 ndst = ip6_route_output(net, NULL, fl6);
1026
1027 if (ndst->error)
1028 goto tx_err_link_failure;
1029 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
1030 if (IS_ERR(ndst)) {
1031 err = PTR_ERR(ndst);
1032 ndst = NULL;
1033 goto tx_err_link_failure;
1034 }
1035 dst = ndst;
1036 }
1037
1038 tdev = dst->dev;
1039
1040 if (tdev == dev) {
1041 stats->collisions++;
1042 net_warn_ratelimited("%s: Local routing loop detected!\n",
1043 t->parms.name);
1044 goto tx_err_dst_release;
1045 }
1046 mtu = dst_mtu(dst) - sizeof(*ipv6h);
1047 if (encap_limit >= 0) {
1048 max_headroom += 8;
1049 mtu -= 8;
1050 }
1051 if (mtu < IPV6_MIN_MTU)
1052 mtu = IPV6_MIN_MTU;
1053 if (skb_dst(skb))
1054 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1055 if (skb->len > mtu) {
1056 *pmtu = mtu;
1057 err = -EMSGSIZE;
1058 goto tx_err_dst_release;
1059 }
1060
1061 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1062
1063 /*
1064 * Okay, now see if we can stuff it in the buffer as-is.
1065 */
1066 max_headroom += LL_RESERVED_SPACE(tdev);
1067
1068 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1069 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1070 struct sk_buff *new_skb;
1071
1072 new_skb = skb_realloc_headroom(skb, max_headroom);
1073 if (!new_skb)
1074 goto tx_err_dst_release;
1075
1076 if (skb->sk)
1077 skb_set_owner_w(new_skb, skb->sk);
1078 consume_skb(skb);
1079 skb = new_skb;
1080 }
1081 if (fl6->flowi6_mark) {
1082 skb_dst_set(skb, dst);
1083 ndst = NULL;
1084 } else {
1085 skb_dst_set_noref(skb, dst);
1086 }
1087 skb->transport_header = skb->network_header;
1088
1089 proto = fl6->flowi6_proto;
1090 if (encap_limit >= 0) {
1091 init_tel_txopt(&opt, encap_limit);
1092 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1093 }
1094
1095 if (likely(!skb->encapsulation)) {
1096 skb_reset_inner_headers(skb);
1097 skb->encapsulation = 1;
1098 }
1099
1100 skb_push(skb, sizeof(struct ipv6hdr));
1101 skb_reset_network_header(skb);
1102 ipv6h = ipv6_hdr(skb);
1103 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1104 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
1105 ipv6h->hop_limit = t->parms.hop_limit;
1106 ipv6h->nexthdr = proto;
1107 ipv6h->saddr = fl6->saddr;
1108 ipv6h->daddr = fl6->daddr;
1109 ip6tunnel_xmit(skb, dev);
1110 if (ndst)
1111 ip6_tnl_dst_store(t, ndst);
1112 return 0;
1113 tx_err_link_failure:
1114 stats->tx_carrier_errors++;
1115 dst_link_failure(skb);
1116 tx_err_dst_release:
1117 dst_release(ndst);
1118 return err;
1119 }
1120
1121 static inline int
1122 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1123 {
1124 struct ip6_tnl *t = netdev_priv(dev);
1125 const struct iphdr *iph = ip_hdr(skb);
1126 int encap_limit = -1;
1127 struct flowi6 fl6;
1128 __u8 dsfield;
1129 __u32 mtu;
1130 u8 tproto;
1131 int err;
1132
1133 tproto = ACCESS_ONCE(t->parms.proto);
1134 if (tproto != IPPROTO_IPIP && tproto != 0)
1135 return -1;
1136
1137 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1138 encap_limit = t->parms.encap_limit;
1139
1140 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1141 fl6.flowi6_proto = IPPROTO_IPIP;
1142
1143 dsfield = ipv4_get_dsfield(iph);
1144
1145 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1146 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1147 & IPV6_TCLASS_MASK;
1148 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1149 fl6.flowi6_mark = skb->mark;
1150
1151 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1152 if (err != 0) {
1153 /* XXX: send ICMP error even if DF is not set. */
1154 if (err == -EMSGSIZE)
1155 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1156 htonl(mtu));
1157 return -1;
1158 }
1159
1160 return 0;
1161 }
1162
1163 static inline int
1164 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1165 {
1166 struct ip6_tnl *t = netdev_priv(dev);
1167 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1168 int encap_limit = -1;
1169 __u16 offset;
1170 struct flowi6 fl6;
1171 __u8 dsfield;
1172 __u32 mtu;
1173 u8 tproto;
1174 int err;
1175
1176 tproto = ACCESS_ONCE(t->parms.proto);
1177 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1178 ip6_tnl_addr_conflict(t, ipv6h))
1179 return -1;
1180
1181 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1182 if (offset > 0) {
1183 struct ipv6_tlv_tnl_enc_lim *tel;
1184 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1185 if (tel->encap_limit == 0) {
1186 icmpv6_send(skb, ICMPV6_PARAMPROB,
1187 ICMPV6_HDR_FIELD, offset + 2);
1188 return -1;
1189 }
1190 encap_limit = tel->encap_limit - 1;
1191 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1192 encap_limit = t->parms.encap_limit;
1193
1194 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1195 fl6.flowi6_proto = IPPROTO_IPV6;
1196
1197 dsfield = ipv6_get_dsfield(ipv6h);
1198 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1199 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1200 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1201 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1202 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1203 fl6.flowi6_mark = skb->mark;
1204
1205 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1206 if (err != 0) {
1207 if (err == -EMSGSIZE)
1208 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1209 return -1;
1210 }
1211
1212 return 0;
1213 }
1214
1215 static netdev_tx_t
1216 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1217 {
1218 struct ip6_tnl *t = netdev_priv(dev);
1219 struct net_device_stats *stats = &t->dev->stats;
1220 int ret;
1221
1222 switch (skb->protocol) {
1223 case htons(ETH_P_IP):
1224 ret = ip4ip6_tnl_xmit(skb, dev);
1225 break;
1226 case htons(ETH_P_IPV6):
1227 ret = ip6ip6_tnl_xmit(skb, dev);
1228 break;
1229 default:
1230 goto tx_err;
1231 }
1232
1233 if (ret < 0)
1234 goto tx_err;
1235
1236 return NETDEV_TX_OK;
1237
1238 tx_err:
1239 stats->tx_errors++;
1240 stats->tx_dropped++;
1241 kfree_skb(skb);
1242 return NETDEV_TX_OK;
1243 }
1244
1245 static void ip6_tnl_link_config(struct ip6_tnl *t)
1246 {
1247 struct net_device *dev = t->dev;
1248 struct __ip6_tnl_parm *p = &t->parms;
1249 struct flowi6 *fl6 = &t->fl.u.ip6;
1250
1251 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1252 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1253
1254 /* Set up flowi template */
1255 fl6->saddr = p->laddr;
1256 fl6->daddr = p->raddr;
1257 fl6->flowi6_oif = p->link;
1258 fl6->flowlabel = 0;
1259
1260 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1261 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1262 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1263 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1264
1265 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1266 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1267
1268 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1269 dev->flags |= IFF_POINTOPOINT;
1270 else
1271 dev->flags &= ~IFF_POINTOPOINT;
1272
1273 dev->iflink = p->link;
1274
1275 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1276 int strict = (ipv6_addr_type(&p->raddr) &
1277 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1278
1279 struct rt6_info *rt = rt6_lookup(t->net,
1280 &p->raddr, &p->laddr,
1281 p->link, strict);
1282
1283 if (rt == NULL)
1284 return;
1285
1286 if (rt->dst.dev) {
1287 dev->hard_header_len = rt->dst.dev->hard_header_len +
1288 sizeof(struct ipv6hdr);
1289
1290 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr);
1291 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1292 dev->mtu -= 8;
1293
1294 if (dev->mtu < IPV6_MIN_MTU)
1295 dev->mtu = IPV6_MIN_MTU;
1296 }
1297 ip6_rt_put(rt);
1298 }
1299 }
1300
1301 /**
1302 * ip6_tnl_change - update the tunnel parameters
1303 * @t: tunnel to be changed
1304 * @p: tunnel configuration parameters
1305 *
1306 * Description:
1307 * ip6_tnl_change() updates the tunnel parameters
1308 **/
1309
1310 static int
1311 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1312 {
1313 t->parms.laddr = p->laddr;
1314 t->parms.raddr = p->raddr;
1315 t->parms.flags = p->flags;
1316 t->parms.hop_limit = p->hop_limit;
1317 t->parms.encap_limit = p->encap_limit;
1318 t->parms.flowinfo = p->flowinfo;
1319 t->parms.link = p->link;
1320 t->parms.proto = p->proto;
1321 ip6_tnl_dst_reset(t);
1322 ip6_tnl_link_config(t);
1323 return 0;
1324 }
1325
1326 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1327 {
1328 struct net *net = t->net;
1329 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1330 int err;
1331
1332 ip6_tnl_unlink(ip6n, t);
1333 synchronize_net();
1334 err = ip6_tnl_change(t, p);
1335 ip6_tnl_link(ip6n, t);
1336 netdev_state_change(t->dev);
1337 return err;
1338 }
1339
1340 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1341 {
1342 /* for default tnl0 device allow to change only the proto */
1343 t->parms.proto = p->proto;
1344 netdev_state_change(t->dev);
1345 return 0;
1346 }
1347
1348 static void
1349 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1350 {
1351 p->laddr = u->laddr;
1352 p->raddr = u->raddr;
1353 p->flags = u->flags;
1354 p->hop_limit = u->hop_limit;
1355 p->encap_limit = u->encap_limit;
1356 p->flowinfo = u->flowinfo;
1357 p->link = u->link;
1358 p->proto = u->proto;
1359 memcpy(p->name, u->name, sizeof(u->name));
1360 }
1361
1362 static void
1363 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1364 {
1365 u->laddr = p->laddr;
1366 u->raddr = p->raddr;
1367 u->flags = p->flags;
1368 u->hop_limit = p->hop_limit;
1369 u->encap_limit = p->encap_limit;
1370 u->flowinfo = p->flowinfo;
1371 u->link = p->link;
1372 u->proto = p->proto;
1373 memcpy(u->name, p->name, sizeof(u->name));
1374 }
1375
1376 /**
1377 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1378 * @dev: virtual device associated with tunnel
1379 * @ifr: parameters passed from userspace
1380 * @cmd: command to be performed
1381 *
1382 * Description:
1383 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1384 * from userspace.
1385 *
1386 * The possible commands are the following:
1387 * %SIOCGETTUNNEL: get tunnel parameters for device
1388 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1389 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1390 * %SIOCDELTUNNEL: delete tunnel
1391 *
1392 * The fallback device "ip6tnl0", created during module
1393 * initialization, can be used for creating other tunnel devices.
1394 *
1395 * Return:
1396 * 0 on success,
1397 * %-EFAULT if unable to copy data to or from userspace,
1398 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1399 * %-EINVAL if passed tunnel parameters are invalid,
1400 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1401 * %-ENODEV if attempting to change or delete a nonexisting device
1402 **/
1403
1404 static int
1405 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1406 {
1407 int err = 0;
1408 struct ip6_tnl_parm p;
1409 struct __ip6_tnl_parm p1;
1410 struct ip6_tnl *t = netdev_priv(dev);
1411 struct net *net = t->net;
1412 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1413
1414 switch (cmd) {
1415 case SIOCGETTUNNEL:
1416 if (dev == ip6n->fb_tnl_dev) {
1417 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1418 err = -EFAULT;
1419 break;
1420 }
1421 ip6_tnl_parm_from_user(&p1, &p);
1422 t = ip6_tnl_locate(net, &p1, 0);
1423 if (t == NULL)
1424 t = netdev_priv(dev);
1425 } else {
1426 memset(&p, 0, sizeof(p));
1427 }
1428 ip6_tnl_parm_to_user(&p, &t->parms);
1429 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1430 err = -EFAULT;
1431 }
1432 break;
1433 case SIOCADDTUNNEL:
1434 case SIOCCHGTUNNEL:
1435 err = -EPERM;
1436 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1437 break;
1438 err = -EFAULT;
1439 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1440 break;
1441 err = -EINVAL;
1442 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1443 p.proto != 0)
1444 break;
1445 ip6_tnl_parm_from_user(&p1, &p);
1446 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1447 if (cmd == SIOCCHGTUNNEL) {
1448 if (t != NULL) {
1449 if (t->dev != dev) {
1450 err = -EEXIST;
1451 break;
1452 }
1453 } else
1454 t = netdev_priv(dev);
1455 if (dev == ip6n->fb_tnl_dev)
1456 err = ip6_tnl0_update(t, &p1);
1457 else
1458 err = ip6_tnl_update(t, &p1);
1459 }
1460 if (t) {
1461 err = 0;
1462 ip6_tnl_parm_to_user(&p, &t->parms);
1463 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1464 err = -EFAULT;
1465
1466 } else
1467 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1468 break;
1469 case SIOCDELTUNNEL:
1470 err = -EPERM;
1471 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1472 break;
1473
1474 if (dev == ip6n->fb_tnl_dev) {
1475 err = -EFAULT;
1476 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1477 break;
1478 err = -ENOENT;
1479 ip6_tnl_parm_from_user(&p1, &p);
1480 t = ip6_tnl_locate(net, &p1, 0);
1481 if (t == NULL)
1482 break;
1483 err = -EPERM;
1484 if (t->dev == ip6n->fb_tnl_dev)
1485 break;
1486 dev = t->dev;
1487 }
1488 err = 0;
1489 unregister_netdevice(dev);
1490 break;
1491 default:
1492 err = -EINVAL;
1493 }
1494 return err;
1495 }
1496
1497 /**
1498 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1499 * @dev: virtual device associated with tunnel
1500 * @new_mtu: the new mtu
1501 *
1502 * Return:
1503 * 0 on success,
1504 * %-EINVAL if mtu too small
1505 **/
1506
1507 static int
1508 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1509 {
1510 struct ip6_tnl *tnl = netdev_priv(dev);
1511
1512 if (tnl->parms.proto == IPPROTO_IPIP) {
1513 if (new_mtu < 68)
1514 return -EINVAL;
1515 } else {
1516 if (new_mtu < IPV6_MIN_MTU)
1517 return -EINVAL;
1518 }
1519 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1520 return -EINVAL;
1521 dev->mtu = new_mtu;
1522 return 0;
1523 }
1524
1525
1526 static const struct net_device_ops ip6_tnl_netdev_ops = {
1527 .ndo_init = ip6_tnl_dev_init,
1528 .ndo_uninit = ip6_tnl_dev_uninit,
1529 .ndo_start_xmit = ip6_tnl_xmit,
1530 .ndo_do_ioctl = ip6_tnl_ioctl,
1531 .ndo_change_mtu = ip6_tnl_change_mtu,
1532 .ndo_get_stats = ip6_get_stats,
1533 };
1534
1535
1536 /**
1537 * ip6_tnl_dev_setup - setup virtual tunnel device
1538 * @dev: virtual device associated with tunnel
1539 *
1540 * Description:
1541 * Initialize function pointers and device parameters
1542 **/
1543
1544 static void ip6_tnl_dev_setup(struct net_device *dev)
1545 {
1546 struct ip6_tnl *t;
1547
1548 dev->netdev_ops = &ip6_tnl_netdev_ops;
1549 dev->destructor = ip6_dev_free;
1550
1551 dev->type = ARPHRD_TUNNEL6;
1552 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
1553 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr);
1554 t = netdev_priv(dev);
1555 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1556 dev->mtu -= 8;
1557 dev->flags |= IFF_NOARP;
1558 dev->addr_len = sizeof(struct in6_addr);
1559 netif_keep_dst(dev);
1560 /* This perm addr will be used as interface identifier by IPv6 */
1561 dev->addr_assign_type = NET_ADDR_RANDOM;
1562 eth_random_addr(dev->perm_addr);
1563 }
1564
1565
1566 /**
1567 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1568 * @dev: virtual device associated with tunnel
1569 **/
1570
1571 static inline int
1572 ip6_tnl_dev_init_gen(struct net_device *dev)
1573 {
1574 struct ip6_tnl *t = netdev_priv(dev);
1575
1576 t->dev = dev;
1577 t->net = dev_net(dev);
1578 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1579 if (!dev->tstats)
1580 return -ENOMEM;
1581 return 0;
1582 }
1583
1584 /**
1585 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1586 * @dev: virtual device associated with tunnel
1587 **/
1588
1589 static int ip6_tnl_dev_init(struct net_device *dev)
1590 {
1591 struct ip6_tnl *t = netdev_priv(dev);
1592 int err = ip6_tnl_dev_init_gen(dev);
1593
1594 if (err)
1595 return err;
1596 ip6_tnl_link_config(t);
1597 return 0;
1598 }
1599
1600 /**
1601 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1602 * @dev: fallback device
1603 *
1604 * Return: 0
1605 **/
1606
1607 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1608 {
1609 struct ip6_tnl *t = netdev_priv(dev);
1610 struct net *net = dev_net(dev);
1611 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1612
1613 t->parms.proto = IPPROTO_IPV6;
1614 dev_hold(dev);
1615
1616 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1617 return 0;
1618 }
1619
1620 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1621 {
1622 u8 proto;
1623
1624 if (!data || !data[IFLA_IPTUN_PROTO])
1625 return 0;
1626
1627 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1628 if (proto != IPPROTO_IPV6 &&
1629 proto != IPPROTO_IPIP &&
1630 proto != 0)
1631 return -EINVAL;
1632
1633 return 0;
1634 }
1635
1636 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1637 struct __ip6_tnl_parm *parms)
1638 {
1639 memset(parms, 0, sizeof(*parms));
1640
1641 if (!data)
1642 return;
1643
1644 if (data[IFLA_IPTUN_LINK])
1645 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1646
1647 if (data[IFLA_IPTUN_LOCAL])
1648 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1649 sizeof(struct in6_addr));
1650
1651 if (data[IFLA_IPTUN_REMOTE])
1652 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1653 sizeof(struct in6_addr));
1654
1655 if (data[IFLA_IPTUN_TTL])
1656 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1657
1658 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1659 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1660
1661 if (data[IFLA_IPTUN_FLOWINFO])
1662 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1663
1664 if (data[IFLA_IPTUN_FLAGS])
1665 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1666
1667 if (data[IFLA_IPTUN_PROTO])
1668 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1669 }
1670
1671 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1672 struct nlattr *tb[], struct nlattr *data[])
1673 {
1674 struct net *net = dev_net(dev);
1675 struct ip6_tnl *nt;
1676
1677 nt = netdev_priv(dev);
1678 ip6_tnl_netlink_parms(data, &nt->parms);
1679
1680 if (ip6_tnl_locate(net, &nt->parms, 0))
1681 return -EEXIST;
1682
1683 return ip6_tnl_create2(dev);
1684 }
1685
1686 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1687 struct nlattr *data[])
1688 {
1689 struct ip6_tnl *t = netdev_priv(dev);
1690 struct __ip6_tnl_parm p;
1691 struct net *net = t->net;
1692 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1693
1694 if (dev == ip6n->fb_tnl_dev)
1695 return -EINVAL;
1696
1697 ip6_tnl_netlink_parms(data, &p);
1698
1699 t = ip6_tnl_locate(net, &p, 0);
1700
1701 if (t) {
1702 if (t->dev != dev)
1703 return -EEXIST;
1704 } else
1705 t = netdev_priv(dev);
1706
1707 return ip6_tnl_update(t, &p);
1708 }
1709
1710 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1711 {
1712 struct net *net = dev_net(dev);
1713 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1714
1715 if (dev != ip6n->fb_tnl_dev)
1716 unregister_netdevice_queue(dev, head);
1717 }
1718
1719 static size_t ip6_tnl_get_size(const struct net_device *dev)
1720 {
1721 return
1722 /* IFLA_IPTUN_LINK */
1723 nla_total_size(4) +
1724 /* IFLA_IPTUN_LOCAL */
1725 nla_total_size(sizeof(struct in6_addr)) +
1726 /* IFLA_IPTUN_REMOTE */
1727 nla_total_size(sizeof(struct in6_addr)) +
1728 /* IFLA_IPTUN_TTL */
1729 nla_total_size(1) +
1730 /* IFLA_IPTUN_ENCAP_LIMIT */
1731 nla_total_size(1) +
1732 /* IFLA_IPTUN_FLOWINFO */
1733 nla_total_size(4) +
1734 /* IFLA_IPTUN_FLAGS */
1735 nla_total_size(4) +
1736 /* IFLA_IPTUN_PROTO */
1737 nla_total_size(1) +
1738 0;
1739 }
1740
1741 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1742 {
1743 struct ip6_tnl *tunnel = netdev_priv(dev);
1744 struct __ip6_tnl_parm *parm = &tunnel->parms;
1745
1746 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1747 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1748 &parm->laddr) ||
1749 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1750 &parm->raddr) ||
1751 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1752 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1753 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1754 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1755 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1756 goto nla_put_failure;
1757 return 0;
1758
1759 nla_put_failure:
1760 return -EMSGSIZE;
1761 }
1762
1763 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1764 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1765 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1766 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1767 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1768 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1769 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1770 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1771 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1772 };
1773
1774 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1775 .kind = "ip6tnl",
1776 .maxtype = IFLA_IPTUN_MAX,
1777 .policy = ip6_tnl_policy,
1778 .priv_size = sizeof(struct ip6_tnl),
1779 .setup = ip6_tnl_dev_setup,
1780 .validate = ip6_tnl_validate,
1781 .newlink = ip6_tnl_newlink,
1782 .changelink = ip6_tnl_changelink,
1783 .dellink = ip6_tnl_dellink,
1784 .get_size = ip6_tnl_get_size,
1785 .fill_info = ip6_tnl_fill_info,
1786 };
1787
1788 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1789 .handler = ip4ip6_rcv,
1790 .err_handler = ip4ip6_err,
1791 .priority = 1,
1792 };
1793
1794 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1795 .handler = ip6ip6_rcv,
1796 .err_handler = ip6ip6_err,
1797 .priority = 1,
1798 };
1799
1800 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1801 {
1802 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1803 struct net_device *dev, *aux;
1804 int h;
1805 struct ip6_tnl *t;
1806 LIST_HEAD(list);
1807
1808 for_each_netdev_safe(net, dev, aux)
1809 if (dev->rtnl_link_ops == &ip6_link_ops)
1810 unregister_netdevice_queue(dev, &list);
1811
1812 for (h = 0; h < HASH_SIZE; h++) {
1813 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1814 while (t != NULL) {
1815 /* If dev is in the same netns, it has already
1816 * been added to the list by the previous loop.
1817 */
1818 if (!net_eq(dev_net(t->dev), net))
1819 unregister_netdevice_queue(t->dev, &list);
1820 t = rtnl_dereference(t->next);
1821 }
1822 }
1823
1824 unregister_netdevice_many(&list);
1825 }
1826
1827 static int __net_init ip6_tnl_init_net(struct net *net)
1828 {
1829 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1830 struct ip6_tnl *t = NULL;
1831 int err;
1832
1833 ip6n->tnls[0] = ip6n->tnls_wc;
1834 ip6n->tnls[1] = ip6n->tnls_r_l;
1835
1836 err = -ENOMEM;
1837 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1838 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
1839
1840 if (!ip6n->fb_tnl_dev)
1841 goto err_alloc_dev;
1842 dev_net_set(ip6n->fb_tnl_dev, net);
1843 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1844 /* FB netdevice is special: we have one, and only one per netns.
1845 * Allowing to move it to another netns is clearly unsafe.
1846 */
1847 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1848
1849 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1850 if (err < 0)
1851 goto err_register;
1852
1853 err = register_netdev(ip6n->fb_tnl_dev);
1854 if (err < 0)
1855 goto err_register;
1856
1857 t = netdev_priv(ip6n->fb_tnl_dev);
1858
1859 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1860 return 0;
1861
1862 err_register:
1863 ip6_dev_free(ip6n->fb_tnl_dev);
1864 err_alloc_dev:
1865 return err;
1866 }
1867
1868 static void __net_exit ip6_tnl_exit_net(struct net *net)
1869 {
1870 rtnl_lock();
1871 ip6_tnl_destroy_tunnels(net);
1872 rtnl_unlock();
1873 }
1874
1875 static struct pernet_operations ip6_tnl_net_ops = {
1876 .init = ip6_tnl_init_net,
1877 .exit = ip6_tnl_exit_net,
1878 .id = &ip6_tnl_net_id,
1879 .size = sizeof(struct ip6_tnl_net),
1880 };
1881
1882 /**
1883 * ip6_tunnel_init - register protocol and reserve needed resources
1884 *
1885 * Return: 0 on success
1886 **/
1887
1888 static int __init ip6_tunnel_init(void)
1889 {
1890 int err;
1891
1892 err = register_pernet_device(&ip6_tnl_net_ops);
1893 if (err < 0)
1894 goto out_pernet;
1895
1896 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1897 if (err < 0) {
1898 pr_err("%s: can't register ip4ip6\n", __func__);
1899 goto out_ip4ip6;
1900 }
1901
1902 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1903 if (err < 0) {
1904 pr_err("%s: can't register ip6ip6\n", __func__);
1905 goto out_ip6ip6;
1906 }
1907 err = rtnl_link_register(&ip6_link_ops);
1908 if (err < 0)
1909 goto rtnl_link_failed;
1910
1911 return 0;
1912
1913 rtnl_link_failed:
1914 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1915 out_ip6ip6:
1916 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1917 out_ip4ip6:
1918 unregister_pernet_device(&ip6_tnl_net_ops);
1919 out_pernet:
1920 return err;
1921 }
1922
1923 /**
1924 * ip6_tunnel_cleanup - free resources and unregister protocol
1925 **/
1926
1927 static void __exit ip6_tunnel_cleanup(void)
1928 {
1929 rtnl_link_unregister(&ip6_link_ops);
1930 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1931 pr_info("%s: can't deregister ip4ip6\n", __func__);
1932
1933 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1934 pr_info("%s: can't deregister ip6ip6\n", __func__);
1935
1936 unregister_pernet_device(&ip6_tnl_net_ops);
1937 }
1938
1939 module_init(ip6_tunnel_init);
1940 module_exit(ip6_tunnel_cleanup);
Linux with added FPC-III support